code: def __init__(self, sDim, xDim, yDim, attDim):
      super(DecoderUnit, self).__init__()
      self.sDim = sDim
      self.xDim = xDim
      self.yDim = yDim
      self.attDim = attDim
      self.emdDim = attDim
  
      self.attention_unit = AttentionUnit(sDim, xDim, attDim)
      self.tgt_embedding = nn.Embedding(
          yDim + 1,
          self.emdDim,
          weight_attr=nn.initializer.Normal(std=0.01),
      )  # the last is used for <BOS>
      self.gru = nn.GRUCell(
          input_size=xDim + self.emdDim, hidden_size=sDim
      )
      self.fc = nn.Linear(
          sDim,
          yDim,
          weight_attr=nn.initializer.Normal(std=0.01),
          bias_attr=nn.initializer.Constant(value=0),
      )
      self.embed_fc = nn.Linear(300, self.sDim)
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import sys
  import paddle
  from paddle import nn
  from paddle.nn import functional
label_desc: Use image node_id 1 to create a new DecoderUnit object from inherited base classes: nn with example: obj = DecoderUnit(sDim, xDim, yDim, attDim)